Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-06-05
1993-11-30
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253288, 5253297, 5253317, 5253328, 5253329, 5253331, 5253332, 525339, 525355, 525366, 525369, C08F 804
Patent
active
052666530
ABSTRACT:
Poisoning or deactivation of conventional homogeneous catalysts to be used in hydrogenation of the backbone unsaturation in liquid monofunctional and difunctional-terminated conjugated diene polymers, is prevented by reacting a blocking agent compound with the functional end groups present in these polymers. More specifically, subsequent to formation of a selected starting material monofunctional or difunctional-terminated conjugated diene polymer, a suitable blocking agent is reacted with the functional end groups of the polymer enabling relatively inexpensive titanium, iron, cobalt, or nickel-based homogeneous catalysts to be used in hydrogenating the backbone unsaturation of the polymer to a high degree. Subsequent to hydrogenation, the polymer is subjected to conventional hydrolysis using a mineral acid or base to remove the blocking groups and return the hydrogenated conjugated diene polymer to its original functionality.
REFERENCES:
patent: 4866120 (1989-09-01), Rudnick et al.
An article entitled "The Hydrogenation of HO-Terminated Telechelic Polybutadienes in the Presence of a Homogeneous Hydrogenation Catalyst Based on Tris(triphenylphosphine)rhodium Chloride", by Karel Bouchal, Michal Ilavsky, and Eva Zurkova, Institute of Macromolecular Chemistry 165 (1989) 165-180 (Nr. 7216), Czechoslovak Academy of Sciences.
Makromol. Chem. 180, 2309-2321 (1979) Synthese et proprietes d'oligomeres dieniques partiellement et totalement hydrogenes.
Encyclopedia of Polymer Science and Engineering, vol. 7, Fibers, Optical to Hydrogenation, a Wiley-Interscience Publication, John Wiley & Sons.
Lipman Bernard
The B. F. Goodrich Company
LandOfFree
Highly hydrogenated functional-terminated conjugated diene polym does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Highly hydrogenated functional-terminated conjugated diene polym, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Highly hydrogenated functional-terminated conjugated diene polym will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2097475